In the new TextTransformer 1.3.2 texts can be preprocessed while
loading them.

You have to set a second TextTransformer project in the project
options of the first one. The second project then is executed in an
additional instance of the TextTransformer interpreter while the text
is loaded. Then the already preprocessed text is shown in the input
editor of the IDE. There you can start to develop the main processor.

The preprocessing also works in the transformation-manager and with
the command line tool.

A project used for the preprocessor, in turn can get preprocessed by
another project. This way you can accumulate simple remodellings to
achieve complex transformations of texts.